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MM: Fachverband Metall- und Materialphysik

MM 30: Liquid and Amorphous Metals

MM 30.4: Vortrag

Donnerstag, 8. September 2022, 11:00–11:15, H46

Cyclical structural relaxation of PdNiP and micro-alloyed PdNiPFe and PdNiPCo glasses — •Manoel W. da Silva Pinto, Mark Stringe, Katharina Spangenberg, Harald Rösner, and Gerhard Wilde — Institut für Materialphysik, WWU Münster

Relaxation phenomena in Pd₄₀Ni₄₀P₂₀ bulk metallic glasses (BMG) as well as in micro-alloyed forms of Co and Fe addition were investigated by calorimetry. The BMGs were submitted to different thermal treatments by varying temperatures and times. In order to identify distinct signatures of relaxation, the thermal and temporal evolution of enthalpic contributions to calorimetric signals were analyzed using different kinetic models. A possibility was found to control the formation and depletion of an endothermic signature before the glass transition by quenching and annealing procedures. From the evolution of the enthalpies with annealing time and from isothermal heat flow, time constants related to structural relaxation were obtained and supplemented by dynamical and structural TEM analyses. The obtained results are discussed with respect to existing models for glass relaxation.